Archeologists are still unsure if this king ruled his own part of the Egyptian kingdom parallel to Ramses II or in his own dynasty, because in his era he destroyed a lot of cultural treasures to establish his own monotheistic cult.

This prolific, late 19th century, serial killer brutally murdered women. The murderer continued until his/her murders started making headlines. Then the killings just stopped and the killer was never caught.

It was not Jack the Ripper. However, given that the murders in question took place before the murders by Jack the Ripper (and neither were caught) I suppose we can't positively say it wasn't the same person. However, in the case of this question, it was not Jack the Ripper.

There was an American murderer,..The "servant girl killer" or something similar?

Close enough! The Servant Girl Annihilator was the moniker penned by writer O.Henry. The string of murders took place in Austin, Texas USA between 1884 and 1885. The killer's first six victims were servants (all black) so didn't get much press until the next two (and final) victims were killed and they happened to be white. Then the media hysteria started and the killing stopped.